1. P O L Y G O N S 2-6

2. DEFINITION A POLYGON is the union of segments in the same plane such that each segment intersects exactly two others at their endpoints. Hint: there are 4 separate phrases in the definition -- memorize it!

3. TERMS: Sides - Vertex – Consecutive vertices/sides or Adjacent vertices/sides - Diagonal - the segments in the polygon. the endpoints of the segments. endpoints of the same segment or sharing a point a segment connecting NON-adjacent vertices.. H E O S U

4. DEFINITION A POLYGONAL REGION is the union of the polygon and its interior.

5. Names of Polygons: Know 3 sides up to 10 sides and 12 sides. 3 - TRIANGLE

6. Names of Polygons: 4 - QUADRILATERAL

7. Names of Polygons: 5 - PENTAGON

8. Names of Polygons: 6 - HEXAGON

9. Names of Polygons: 7 - HEPTAGON

10. Names of Polygons: 8 - OCTAGON

11. Names of Polygons: 9 - NONAGON 10 - DECAGON 12 - DODECAGON

12. TRIANGLES: Equilateral Isosceles Scalene - ALL sides equal - TWO sides equal - NO sides equal

13. HIERARCHY TREE: FIGURE POLYGON TRIANGLE SCALENEISOSCELES EQUILATERAL

14. HOMEWORK #1-14, #26